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应用过镇海提出的应力-应变曲线模型,建立了混凝土的荷载-挠度曲线模型。使用所建立的荷载-挠度曲线模型和最小二乘拟合方法,对不同强度等级和养护龄期混凝土的荷载-挠度曲线进行了拟合,同时比较了使用部分和全部测试数据进行拟合所得断裂能计算结果的差异。研究结果表明:所建立的荷载-挠度曲线模型可很好地对实测荷载-挠度曲线进行拟合,同时,使用所建立的荷载-挠度曲线模型,可利用大于反弯点的部分数据来很好地拟合外延整个荷载-挠度曲线。
The stress-strain curve model proposed by Zhenhai has been used to establish the load-deflection curve model of concrete. The load-deflection curves of concrete with different strength grades and curing ages were fitted by using the established load-deflection curve model and the least square fitting method, and the fractures obtained by fitting with some or all of the test data were compared Can calculate the difference of the result. The results show that the established load-deflection curve model can well fit the measured load-deflection curve. At the same time, using the established load-deflection curve model, some data larger than the inflection point can be used well Fitting the entire load-deflection curve.